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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a36a5e26b9d30735eab82efba689a559dadd8e1ba3d4c2da824fb4c9ccc9dee4' 
  AND token = 'GFoOvL3aK5Srog3PTJa8mhsKVSHFhqU3tHKRB0oPOoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}